Paddle or plunger for molten glass



K. E. PEILER.

PADDLE 0R PLUNGER FOR MOLTEN GLASS.

APPLICATION FILED MAR. 27 Hill- 1,328,799, Patented Jan. 20, 1920.

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. PADDLE on. rmmona Fon'noLrnN GLASS.

Specification of Letters Patent.

Application filed March 27,1917. 1 Serlal- No. 157,654;

. citizen of the United States, residing at Hartford, in the count ofHartford and State of. Connecticut, I ave invented new and usefulImprovements in Paddles or Plungers for Molten Glass," of which the 1following is a specification.

This invention relates to theconstruction of a stirrer or paddle orplunger for working in molten glass. It is herein shown and described asdesigned for use in amachine for feeding or gathering charges of moltenglass of uniform size suitable for subsequent pressing, blowing orotherwise sha ing to commercial form. Such paddles or p ungers arerequired to operate in or to' dip 1nto molten glass, and consequentlythey are-subjected, particularly the head ends, to very high heat.

The object of this invention'is to construct a paddle or plungerfor-'amachine of this character in such manner that it is inexpensive tomake and durable in use, in that it will not readily bend or break orburn" out, or become otherwise impaired as a re sult of the action ofthe high heat to which it is subjected when operating in or dipped intothe molte glass,

This object is attamedby a construction in which an operating head ofheat resistmg refractory material, such as pot .clay,

adapted for workin in molten glass, in-

' cased in a metallic reinforcementwhich may serve also as a support bymeans of which the operating head is attached to a holder or carrierof-the machine or apparatus by which the head is operated, and thismetallic would otherwise break too easily when 4 moved through the hotviscous glass. On

reinforcement, or carrier, is provided with passages through which airor other cooling medium may be circulated. Being thus kept below thetemperature at which it wou d bend easily, the metal forms a supportingand reinforcing backbone for'its surround-' ing shell 1 of refractorymaterial, which being usually of weak and brittle character,

the other hand, the refractory material shields the metallic supportfrom direct con-- tact with the intensely hot glass, so that-the partsmutually protect each other. I

Figure 1 of the accompanying drawings shows a side elevation of a paddlewhich fOr' securing the head to the-support. Fig.

. 2 is a plan view in-cross-section,' taken at the line 2 -'.2 on Fig.1, illustrating the manner of centralizing the pipe provided forintroducing cooling air into the support.

Fig. '3 shows a 'tran'sverse section on the plane indicated by the line33-3 on 'Fig. 1, Fig. 4shows'a transverse section acrosspart of the headon'the plane indicated" by ,the

. 1' line 44 on Fig. 1. Fig.5 showsa trans-. I

verse section across'the head on the plane indicated by the line 5--5 onFi 1.

The paddle illustrated in the rawings is only one of manyformsin'which'this invention may be applied. Through the head .1 and itshub 2 is a central longitudinal core, the lower part; 3 of which is'larger in diameter than the upperpart 4 so as to providea shoulder 5.-Tl'1e' lower part of the core in the head is preferably flattened on oneside, as alt 6, or otherwisemade irregular in shape, to prevent therefractory parts from turning on the metallic support, and in this coreat its upper end is placed an interiorly threaded metal cap 7 which isalso flattened onits outer side as shown in Fig.

movement be cemented in place, preferably'by fire cla- 'In order to'more securely hold this plilg. in place, it may be provided-with anannular groove 9, and a coinciding'annular groove 10 may be made aroundthe interiorof the core-for receiving fire' clay or other cementingmaterial when the parts are assembled.

' The shankof the paddle above the heady "is preferably built up ofseparate sleeves or collars 1-1 of refractory material, like that of thehead 1.-' These collars have their central openings of the samediameter, as

the small part 4 of the core through the head. The collars are usuallycemented together and to the metal support 12 by fire clay lorothersuitable heat resisting ma-.' teria 55 embodies the invention, witha portion of The support 12 for this paddle is a metal ture of thesupporting tube 12 below the tube, the lower'end of which, is threadedwhich may be utilized for supporting the tube on the holder or carrier 1of the machine, in which this implement is to be used. For the purposeof keeping the tempera;

point at which it would easily bend, a pipe of smaller exterior diameterthan the mterior diameter of the supportmg tube 12 extends through thattube, its lower end besufficiently to ing centered with the nut 7 bymeans of a washer 17. The sides of the lower end of the pipe 15 are cutawa as at 18, thus opening 1t into the tube.

y with the tube 12 by screws 16, and it is designed to be connected withan suitable source of cooling air or other fluld under pressure, so thatthe cooling fluid will flow down through the pipe 15 to the head of thepaddle, and return around the pipe 15, in such manner as to cool thepipe and the supporting tube 12 prevent them from being overheated.

' With this construction the metal parts are protected from heat, andall expansion and contraction due to the heating of the paddle when itis operating on the hot molten glass and its cooling when removedtherefrom can take place without'subjecting any of the parts to unduestrains such as would cause them to break or deteriorate.

The operating head ma be of any form desired, for its intende stirrer,or paddle, or plunger, or for its mode of operation. The protectingcollars 11 on the shank herein shown as being cylindrical may be of anycross section, or form, or length desired.

The metallic reinforcement, or support, is herein shown as being builtup of standard commercial forms of iping, which are inexpensive, andeasily 0 tainable almost anywhere. The reinforcement may, however, bemade of cast metal, in one or more pieces, with passages drilled orcored therein for the circulation of the cooling fluid. Moreover, thereinforcing member may be of any desired cross section. When cylindricalmembers are employed some portions should be flattened as shown at 6, orotherwise made' irregularin form to prevent the head and its reinforcingmember from turning relative to each other.

' The refractory material of the head which is herein shown as beingbuilt up of separate sections, may for some purposes be made in fewerpieces, or in a single piece, for purposes in which the expansion andcontraction, to which it is liable, would not be sufficient to disruptor seriously break he upper end of this pipe 15may beheld central t g y11 .ingmem er is pus ed through the head 2,

functions as a the head. Whenever such cracks occur they are liable toextend throughout the entire structure. It is for the purpose ofavoiding these cracks, or at least to confine them locally, that thestructure is preferably built up of separate sections, united by 'fireclay or other suitable heat resisting cement,

which is more elastic or yielding than the more refractory material ofwhich the exposed portions of the head are made. These joints permit oflocal expansion and contraction, and any cracking which may ocour willusually be limited to the oints, or

at least is not liable to extend across the joints from one section ofthe head to another. 1

In assembling these parts, the reinforcing member, if made of separatepieces as shown, is first put together, the nut being screwed on t e pie 12. Then the reinforc from its lower end to the positionshown in Fig.1 and enough of the collars 11 are added to make up the desired lengthof shank, the cement beln applied between the joints. Cement is t eninserted into the core 3 around the'collar 7, thus in effect grouting itin place, after which the plug 8 is inserted and some more of thecement, or grouting if put into the joint, filling up the annulargrooves 9 and 10, 'thus effectively holding the plug in position whenthe cement is set.

The supply pipe 15 may then be inserted to place and secured by screws16.

When-put into use, this implement may be held by any suitable form ofchuck or holder 14.. Connection may be made between.'

the pipe 15 and any convenient supply of air or other cooling fluidunder pressure, by means of an ordinary union coupling, as shown inFig. 1. The connection from the union to the air tank or other source ofsupply may be made by a jointed or flexible pipe, in accordance with thecommon practice in glass working machines.

The invention claimed is 1. An implement for working molten glass,including a head of refractory material having a shouldered openingthrough it and having a flat surface at one side of the opening, atubular reinforcement extending into one end of the opening, a tubefastened within the reinforcement for conveying cooling fluid, anenlarged cap threaded to the reinforcement and flatted on one side toengage the flatted surface of'the head and bearing against the shoulderof the opening,

and a refractory plug closing the other end ing fluid fastened Withinthe reinforcement, and a refractory plug closing one end of the opening.

3. An implement-for working molten glass having a tubular reinforcement,a refractory head with an opening through it mounted on thereinforcement and secured against rotation on the same, a refractoryprotecting shank mounted on the reinforcement above the head, a tube forconveying cooling fluid fastened Within the reinforcement, and arefractory plug closing one end of the opening.

4. An implement for working molten glass having a tubular reinforcement,a refractory head with an annularly grooved opening through it mountedon the reinforcement, means for circulating cooling means through thereinforcement, and a refractory plug closing one end of the opening andhaving an annular groove to match that in the opening.

Signed at Hartford, Connecticut, this 26th day of March, 1917.

KARL E. PEILER.

